BUK9518-55,127

Overview

The BUK9518-55,127 is an N-channel enhancement mode logic level field-effect power transistor manufactured by NXP USA Inc. utilizing TrenchMOS technology in a TO-220AB plastic envelope. It features very low on-state resistance and integral Zener diodes providing electrostatic discharge (ESD) protection up to 2 kV. The device is designed for automotive and general-purpose switching applications with a maximum drain-source voltage of 55 V and a continuous DC drain current of 57 A at 25 °C.

Feature Summary

• TrenchMOS technology enables very low on-state resistance for high efficiency.
• Logic level operation allows direct drive from standard logic interfaces.
• Integral Zener diodes provide internal ESD protection up to 2 kV.

Applications

• Automotive switching circuits
• General purpose switching applications

Procurement Notes

Verify the manufacturer designation as NXP USA Inc., noting the historical Philips Semiconductors origin in the datasheet. Confirm the package type is SOT78 (TO-220AB). Ensure the part number suffix matches the specific ordering code provided. Check for any obsolescence notices or lifecycle status updates directly from the manufacturer before procurement.

Selection Notes

Select this component for applications requiring robust N-channel MOSFET performance with integrated ESD protection. Consider the thermal resistance characteristics and the need for mounting base connection due to the tab-drain configuration. Evaluate the logic level gate threshold requirements against the driving circuit capabilities to ensure reliable turn-on.

Part Context

This component belongs to the BUK95xx series of TrenchMOS transistors. These devices are characterized by their use of advanced trench gate technology to achieve superior conductivity compared to planar structures. The series is widely utilized in power management and motor control environments where low conduction losses are critical.

Replacement Considerations

Consult official replacement guides for cross-references. Verify pinout compatibility and electrical parameter alignment if substituting with other N-channel MOSFETs in the same voltage and current class.

FAQ

What is the primary function of the integral Zener diodes in this device?

The integral Zener diodes provide electrostatic discharge (ESD) protection up to 2 kV, safeguarding the gate oxide layer from damage during handling and operation.

How is the mounting base connected in the TO-220AB package?

In the SOT78 (TO-220AB) package, Pin 2 (Drain) is electrically connected to the mounting base tab.